I can probobly answer that question for you. The Quad City International Airport (MLI) is a fairly good size of an airport. It has over 70 flights a day and goes to 8 different hubs across the US. It also serves as a good place for larger aircraft to land due to its 10,003x150 foot runway which is capable of landing any aircraft in any weather condition. Southwest is used as a charter service alot of times for events and was probobly was used for the Celebrity Golf Tournament taken place at the TPC at Deere Run in Silvis, IL. Southwest does not serve the Quad City International Airport so it has to be a chartered flight.